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正反比例应用题一般采用分开教的方法。我们感到这样做,教正比例应用题时,学生会做正比例应用题,教反比例应用题时,学生会做反比例应用题,但是把正、反比例应用题放在一起,就会出现混淆,导致错误。因此,我们把五年制小学课本第十册中67页例4和75页例4正、反比例应用题放在一起出现,进行对比教学,既揭示它们的内在联系,又区别它们的不同点,效果较好。一、首先判断几组数量的正反比例关系1.速度一定,路程和时间成()比例时间一定,路程和速度成()比例路程一定,速度和时间成
Positive and negative application of the problem generally use separate teaching methods. We feel like this. When teaching proportional propositions, students will do proportional propositions. When they teach inverse proportion propositions, students will do inverse proportionality propositions. However, if you put together positive and inverse proportionality propositions, confusion will result and errors will result. Therefore, we put the five-year primary school textbooks in the tenth volume of 67 cases 4 and 75 cases of 4 positive and inverse applications put together to carry out comparative teaching, both to reveal their internal relations, but also to distinguish their differences, The effect is better. First, the first determine the number of groups of positive and negative proportional relationship 1 speed must be, the distance and time () proportional to the time, distance and speed into () proportional distance, speed and time into